<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="https://cdn.jsdelivr.net/npm/vue@2.6.10/dist/vue.js"></script>
</head>
<body>
    <div id="app">
        输入框1:<input type="text" @input="changeMgs" />
        <br>
        输入框2:<input type="text" @input="msg=$event.target.value" />
        <p>{{msg}}</p>
    </div>
    <script>
        Vue.config.productionTip = false;

        const vm = new Vue({
            el:"#app",
            data() {
                return {
                    msg:"",
                };
            },
            methods: {
                changeMsg(e) {
                    this.msg = e.target.value;
                },
            },
        });
    </script>
</body>
</html>